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      Organ Distribution of Radioactivity and Disappearance of Radioactivity from Plasma After Administration of [ 3H] Luteinizing Hormone-Releasing Hormone to Mice and Rats

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          Abstract

          Whole-body autoradiography of amouse 5 min after an intrajugular injection of 43 nmoles of l-(4-[<sup>3</sup>H]pyro-Glu)-LH-RH (18.3 Ci/mmole) shows a large accumulation of radio-activity in the pituitary, subcutaneous tissue, intestinal wall, kidney, and bladder. Some radioactivity is also found in the liver, lungs, and heart, but no labeling is seen in the central nervous system. Direct measurements of radioactivity in different organs of the rat 5 min after injection of [<sup>3</sup>H] LH-RH also show that the highest accumulation of radioactivity is in the anterior pituitary gland, kidney, epididymal fat, and skin. Low labeling is measured in the posterior (including intermediate) lobe of the pituitary, pineal, liver, submaxillary gland, testis, adrenal, thyroid, and striated muscle. The pattern of plasma radioactivity after a single intravenous injection of [<sup>3</sup>H] LH-RH can be represented by the sum of four exponents, suggesting a four-compartment model of the disappearance of radioactivity from plasma. The metabolic clearance rate is 1.2 ml/min. The half-life of the first exponent (up to 10 min after injection) is about 7.5 min. 30 sec after injection of [<sup>3</sup>H] LH-RH, the radioactivity is distributed in a total volume of 26.5 ml (approximately 11% of body weight).

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          Author and article information

          Journal
          NEN
          Neuroendocrinology
          10.1159/issn.0028-3835
          Neuroendocrinology
          S. Karger AG
          0028-3835
          1423-0194
          1974
          1974
          20 March 2008
          : 16
          : 2
          : 65-73
          Affiliations
          MRC Group in Molecular Endocrinology, Centre Hospitalier de l’Université Laval, Quebec, and Endocrine and Polypeptide Laboratories, V.A. Hospital and Tulane University School of Medicine, New Orleans, La.
          Article
          122553 Neuroendocrinology 1974;16:65–73
          10.1159/000122553
          4610444
          © 1974 S. Karger AG, Basel

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          Page count
          Pages: 9
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